5-Bromo-2-(3-chloro-pyridin-2-yl)-2H-pyrazole-3-carboxylic Acid Synthesis
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Solution Overview
Problem
Conventional methods for producing 5-Bromo-2-(3-chloro-pyridin-2-yl)-2H-pyrazole-3-carboxylic acid face challenges such as low yield, high cost, environmental hazards, and complex operation processes.
Innovation Solution
A novel method involving the formation of a mixture comprising specific compounds and reagents, including inorganic bases and solvents, to synthesize the compound with improved yield and reduced waste, eliminating the need for mixed solvent separations and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for producing 5-Bromo-2-(3-chloro-pyridin-2-yl)-2H-pyrazole-3-carboxylic acid, then the process can be implemented with existing technology, but the overall yield is low and the process is complex
Solution Approach 1:
The synthesis process is divided into distinct sequential steps: Step 1 forms the pyrazole core structure, Step 2 introduces the bromine substituent, and Step 3 generates the carboxylic acid functionality. Each step uses specific reagents and conditions optimized for that transformation, allowing independent optimization and simplifying process control while achieving 50% overall yield
Solution Approach 2:
The patent optimizes reaction parameters including temperature ranges (e.g., -78°C to 0°C for bromination), solvent selections (THF, toluene, DMF), and base choices (LDA, NaOH, K2CO3) for each synthesis step. These parameter changes maximize reaction efficiency and yield while maintaining operational simplicity
2Object-affected harmful factors
If conventional synthesis methods are used, then existing reagents and equipment can be employed, but environmental hazards increase and waste is generated
Solution Approach 1:
The patent employs selective bromination and carboxylation reactions that generate minimal hazardous waste. The use of stoichiometric amounts of reagents like NBS (N-bromosuccinimide) and controlled CO2 introduction converts potentially harmful reactions into beneficial transformations with high atom efficiency and reduced environmental impact
Solution Approach 2:
The synthesis employs inert solvents and controlled atmospheric conditions to prevent unwanted side reactions and minimize hazardous byproducts. The use of anhydrous conditions and inert gas protection during sensitive steps reduces formation of harmful impurities and simplifies waste treatment
3Ease of manufacture
If conventional methods are used, then the process can be operated with standard equipment, but the cost is high and specialized equipment is required
Solution Approach 1:
The patent employs reagents and equipment that can be used across multiple synthesis steps and other pharmaceutical manufacturing processes. Standard laboratory equipment such as round-bottom flasks, condensers, and filtration apparatus are sufficient, eliminating the need for specialized equipment while maintaining manufacturing efficiency and reducing costs
4Ease of operation
If conventional synthesis procedures are used, then the process can be implemented with existing protocols, but operation complexity increases and hazards are reduced
Solution Approach 1:
The patent performs preliminary optimization of reaction conditions including temperature control, reagent addition rates, and solvent selection before scale-up. Safety assessments and procedural standardization are conducted in advance, allowing straightforward implementation with standard equipment while maintaining high process safety and reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves a higher overall yield of 50% with commercially available reagents, reducing costs and process hazards while simplifying operations.
Implementation Method 1
forming a mixture comprising a) a compound of Formula VIII... cc) an inorganic base; and iia) reacting the mixture
Implementation Method 2
mixing a compound of Formula II with a compound of Formula IV in a solvent in the presence of an inorganic base... to form a compound of Formula III
Implementation Method 3
forming a mixture comprising A) a compound of Formula V... B) a metal hydroxide; and II) reacting the mixture
Data Source
AI summary
Described herein are novel methods of synthesizing 5-Bromo-2-(3-chloro-pyridin-2-yl)- 2H-pyrazole-3-carboxylic acid from pyrazole or pyrazole derivatives. Also described herein are novel reaction intermediates.